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    • By Axelwlt
      I am reading big TDMS files (~1GB) and I try to minimize memory usage.
      I read a signal once and I want to keep it for later usage, so I tried to write it to a DVR in the hope that I have only one instance of the data in memory.

      However the task manager tells me that uses 2 times more memory than it should.
      I think the problem is that the array is not deallocated although I don't need it after writing it to the DVR.
      Is there a solution to make sure I don't have copies of data?
    • By Ram Prakash
      Thank you.
    • By Zyl
      Hi everybody,


      Am I missing something ?
      DVR Private POC.zip
    • By Brains
      Thank you!
    • By IpsoFacto
      I've got some weird stuff going on with a cRIO project I'm working on wanted to get some opinions on it. The basic architecture is a set of classes that do some process. That process registers with a server. The internal data of the process is held in a DVR and the server get's access to that DVR. Clients use TCP to ask the server to do something, the server makes a call against the classes DVR and returns a response to the client.
      To simplify the issues I'm seeing I created a class that internally just increments an integer every 500ms. The client asks the server what's the current count, the server asks the Counter class and returns the answer to the client. This works perfectly fine when running the VI in the IDE. When built it connects, will get the JSON message back, but always gets a default value from the DVR call (zero, in this case). As soon as I open a remote debug panel to the cRIO, everything is working. The count is correct, the client calls work, just like normal. As soon as I right-click, close debug, it goes back to zero. Open debug works, close debug, back to zero. I know the DVR isn't getting dropped because the count continues to increment while not in debug, the process is still running happily with no issues.
      Here's a few screenshots of the code;
      Count Class process (get the count, increment, write it back to the DVR) - Counter Class process
      You can see the DVR vi's are actually vim's using a cast. I can't imagine that's the issue.
      Server Side call - Server Side calls
      All this does is get the count from the DVR (same as above) and wraps it in JSON and passes it back to the client as a JSON string.
      I also implemented an Echo class that ignores the process and DVR's, it just takes whatever string you sent form the client to the server and passes it back with a prepended "@echo". This works when running as an executable with the debug turned off so I know the client, server, and the server/class calls are all working as expected.
      Any thoughts here would be welcome, thanks.
      edit: I added the any possible errors coming from the variant cast to the JSON reply. When the debug is open there are no errors, when the debugger is closed it throws error 91, but the in-place element structure reading the DVR does not throw any errors. How can a variant not exist until a debugger is opened and than it magically exists?
      edit: the internal data dictionary is a wrapper around a variant attribute, I wired out the "found?" terminal all the way out to the JSON reply and if the debugger is open the attribute is found, but not if the debugger is closed. Anyone have issues with Variant Attributes in Real-Time?
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